The Envirosense line of water heaters contains a fully submerged, spiral-shaped condensing heat exchange that provides a much greater heat transfer surface than a standard straight flue tube, resulting in up to 96% thermal efficiency and higher hot water output

The 100,000 BTU Envirosense Power Direct Vent gas water heater is equipped with a fully submerged, spiral-shaped condensing heat exchanger and 50 gallons of storage capacity.

This design provides much greater heat transfer surface than a standard straight flue tube, resulting in 96% thermal efficiency and higher hot water output, than comparable 80% efficient water heaters.

With a 22 ̋ diameter, the Envirosense Power Direct Vent can be installed in less space than a 75-gallon unit yet delivers greater recovery and lower operating costs.